Affiliation: | aDepartment of Aerospace and Systems Engineering, Feng Chia University, No. 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan, ROC;bDepartment of Mathematical Sciences, National Chengchi University, No. 64, Sec. 2, ZhipNan Road, Wenshan District, Taipei 11605, Taiwan, ROC |